초록 ▼

A steam-cooling gas turbine in which cooling steam is fed from a center portion of a rotating shaft and recovered through passages disposed at the outer side of the center portion with steam leaking through a seal portion from a feeding steam being effectively recovered. Feed steam (30) serving as c

A steam-cooling gas turbine in which cooling steam is fed from a center portion of a rotating shaft and recovered through passages disposed at the outer side of the center portion with steam leaking through a seal portion from a feeding steam being effectively recovered. Feed steam (30) serving as coolant is supplied to a cavity (27) from a inner cylinder (10) and hence fed to moving blades (11, 12) through recesses (40) formed in a coupling portion (26) interposed between a final-stage disk (24) and a turbine shaft (1), steam feeding pipes (15) and steam feeding passages (11a, 12a). After cooling of the moving blades, steam (31) is recovered through steam recovering passages (11b, 12b), steam recovering pipes (16), radial steam-recovering passages (17), axial steam-recovering passages (18) and outlet openings (5a). The coupling portion (26) is forced to hermetically close under thermal stress, whereby leakage of the feed steam (30) is prevented. Steam leaking through a seal portion constituted by stationary and rotatable seal fin assemblies (4a, 4b) can be effectively recovered. The inner cylinder (10) can move in the axial direction through cooperation of piston rings (43) and a centering piece (6) adapted for absorbing thermal stress induced in the inner cylinder (10). Upstream tip end portions of steam feeding pipes (15) and steam recovering pipes (16) are secured onto a side surface of the first-stage disk (21) through sleeves removably fitted thereto.

대표청구항 ▼

[ What is claimed is:] [1.]1. A steam-cooling type gas turbine, comprising:a turbine shaft for supporting plural stages of disks and plural stages of moving blades;a first steam feeding passage formed internally of said turbine shaft so as to feed steam from a rear end side of said turbine shaft alo

[ What is claimed is:] [1.]1. A steam-cooling type gas turbine, comprising:a turbine shaft for supporting plural stages of disks and plural stages of moving blades;a first steam feeding passage formed internally of said turbine shaft so as to feed steam from a rear end side of said turbine shaft along an axial direction thereof;a plurality of second steam feeding passages for introducing the steam into said disks from said first steam feeding passage to thereby feed said steam to said moving blades for cooling thereof;first steam recovering passages formed in said disks, respectively, so as to receive and recover the steam after cooling of said individual moving blades; anda second steam recovering passage provided internally of said turbine shaft in communication with said first steam recovering passages, respectively, so as to recover the steam after cooling of said moving blades;wherein said first steam feeding passage is so provided as to extend through a center portion of said turbine shaft, while said second steam recovering passage is so provided as to extend along the outer periphery of said first steam feeding passage, and wherein said second steam feeding passages and said first steam recovering passages pass through substantially radially intermediate portions of each disk, respectively.